For bow targeting in low-light conditions, nothing works better than TruGlo's Glo-Brite Peep Sight. An adjustable green insert allows for three separate settings to compensate for different shooting conditions and deliver optimal accuracy. Rubber tubing automatically positions peep. Add versatility to your bow's accuracy with the TruGlo Glo-Brite Peep Sight. Aperture diameter: 3/16". Dimensions: 1" x 4-3/4" x 4-3/4". Weight: 1/10 lb.